Using a shared library to partly replace an archive library - ld changed behaviour

[Graham Hudspith]

H. J. Lu wrote:

>
>Can you try one thing for me?
>
>1. Build and run your original test on RH9.
>2. Send me your output on RH9.
>3. Copy the binaries to FC3.
>4. Run the same binaries, which are built on RH9, on FC3.
>5. Send me your output on FC3.
>
>  
>
H. J. ,

    Thanks for your persistence. Here are the results of building and
    running my example under RH9:

[opt-testing@fender modified]$ make
gcc -B./ -O -g   -c -o main.o main.c
gcc -B./ -O -g -fPIC -c foo.c -o shared.o
gcc -B./ -shared -o libshared1.so shared.o
gcc -B./ -O -g -fPIC -c bar.c -o bar.o
ar rv libfoo.a bar.o
a - bar.o
gcc -B./ -o main1 main.o libshared1.so libfoo.a -Wl,-rpath,.
gcc -B./ -o main2 main.o libfoo.a
gcc -B./ -shared -o libshared3.so shared.o libfoo.a
gcc -B./ -o main3 main.o libshared3.so libfoo.a -Wl,-rpath,.
./main1
Shared library
Real bar
./main2
Real bar
./main3
Shared library
Real bar

    As you can, all three examples work correctly. Now, copying the
    binaries across to an FC3 system:

[gwh@snowball modified]$ make
./main1
Shared library
Real bar
./main2
Real bar
./main3
Shared library
Real bar

    So, the RH9 binaries execute correctly under FC3. Now to BUILD and
    run under FC3:

[gwh@snowball modified]$ make
gcc -B./ -O -g   -c -o main.o main.c
gcc -B./ -O -g -fPIC -c foo.c -o shared.o
gcc -B./ -shared -o libshared1.so shared.o
gcc -B./ -O -g -fPIC -c bar.c -o bar.o
ar rv libfoo.a bar.o
ar: creating libfoo.a
a - bar.o
gcc -B./ -o main1 main.o libshared1.so libfoo.a -Wl,-rpath,.
gcc -B./ -o main2 main.o libfoo.a
gcc -B./ -shared -o libshared3.so shared.o libfoo.a
gcc -B./ -o main3 main.o libshared3.so libfoo.a -Wl,-rpath,.
./main1
Real bar
./main2
Real bar
./main3
Shared library
Real bar

    You can see that the run of "main1" has failed.

    I've attached the source-code again, just so we know which set we
    are talking about.

    Regards,

        Graham.

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